WinRT 8.1 support ?

I'm trying to use caliburn micro for a WinRT 8.1 appplication. It seems that some of the features of caliburn are not working with some controls.
First, I was not able to use the Windows.UI.Interactivity to interact with the HUB header click. I think I've seen a issue fixed about that for Caliburn 2.0. My solution was to switch to "Behaviors SDK" and ICommand.

Another issue that I'm facing is the support of AppBarButton inside CommandBar. Using the usual "x:Name" to VM method binding is not working, so I have to fallback to ICommand implementation.

I just wanted to know if I was right (about this missing features) or if it was me doing something wrong ?